From Cppreference
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| template< class >
class result_of; //not defined
| (1)
| (C++11 feature)
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| template< class F, class... ArgTypes >
class result_of<F(ArgTypes...)>;
| (2)
| (C++11 feature)
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Deduces the return type of a function call expression at compile type.
[edit] Member types
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| Member type
| Definition
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type
| the return type of the function F if called with the arguments ArgTypes...
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[edit] Equivalent definition
template<class>
class result_of;
template<class F, class... ArgTypes>
struct result_of<F(ArgTypes...)>
{
typedef decltype(
std::declval<F>()(std::declval<ArgTypes>()...)
) type;
}; |
[edit] Example
struct S {
double operator()(char, int&);
};
int main()
{
std::result_of<S(char, int&)>::type f = 3.14; // f has type double
}[edit] See also
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| obtains the type of expression in unevaluated context
(function template)
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